RFID Tag Data Truncation and Compression for Bandwidth Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current RFID systems face inefficiencies in data transmission due to the need to send serial number information for each tag, which consumes a significant portion of bandwidth, especially with increasing identifier lengths like sGTIN-198, and existing encoding schemes are not optimized for speed.
Innovation Solution
RFID tags and readers implement explicit or implicit commands to alter the transmission of trailing characters, allowing for truncation, compression, or encryption of tag responses, reducing the number of bits transmitted while maintaining compatibility with existing standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full serial number data is transmitted from each RFID tag, then item-level uniqueness tracking is achieved, but air interface bandwidth is significantly consumed
Solution Approach 1:
The patent extracts only the necessary portion of the serial number data for tracking purposes. By using a selection mask to identify which bits of the EPC identifier are needed for item-level uniqueness, the system transmits only those specific bits rather than the complete serial number, thereby reducing bandwidth consumption while maintaining tracking capability.
Solution Approach 2:
The EPC identifier is segmented into multiple bit portions, with the selection mask specifying which segments are relevant for identification. This segmentation allows the system to transmit only the necessary segments (e.g., bits 0-23 for GTIN-14, bits 24-47 for serial number) separately, optimizing bandwidth usage based on application needs.
2Loss of energy
If serial number portion of EPC identifier is discarded for SKU-level tracking, then bandwidth is reduced, but item-level tracking capability is lost
Solution Approach 1:
The patent implements dynamic data transmission where the selection mask can be adjusted based on the required tracking granularity. For SKU-level tracking, only the GTIN-14 portion (bits 0-23) is transmitted. For item-level tracking, additional serial number bits (bits 24-47) are included. This dynamic adaptation allows the system to optimize between bandwidth efficiency and tracking precision based on operational requirements.
3Loss of energy
If complex encoding schemes like ISO 646 are used for serial numbers, then bit efficiency is improved, but encoding complexity increases
Solution Approach 1:
The patent changes the parameter of data representation by working directly with binary bit portions of the EPC identifier rather than converting to human-readable character encodings. The selection mask operates on bit positions (e.g., bits 0-23, bits 24-47) rather than character positions, eliminating the need for complex encoding schemes like ISO 646 while maintaining full information fidelity and simplifying the encoding/decoding process.
4Productivity
If existing RFID tags and readers are modified to support data alteration commands, then transmission efficiency is improved, but compatibility with existing systems decreases
Solution Approach 1:
The patent implements multi-functionality by making the data transmission format adaptive rather than fixed. The same RFID tag and reader infrastructure can operate in multiple modes: transmitting full EPC identifiers for item-level tracking, transmitting truncated identifiers for SKU-level tracking, or transmitting selectively masked portions based on application requirements. This universal approach allows enhanced systems to interoperate with existing RFID infrastructure while providing improved efficiency when needed.
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
Methods, systems, and apparatuses for RFID tags, RFID readers, communications algorithms, and RFID-related applications are described herein. In an aspect of the invention, an RFID tag is capable of storing data, receiving a signal from a reader, determining a response taking into account the tag mode and the data, and transmitting a response to the reader. The data includes a first plurality of bits and a second plurality of bits. The tag mode may be set by a current or a prior command by the reader. Depending on the tag mode, the response may be complete, or the second plurality of bits may be truncated, compressed, or encrypted. In an aspect of the invention, the response includes an implicit indication of whether the response is complete, truncated, encrypted, or compressed. In another aspect of the invention, a command from the reader indicates how many bits should be truncated, compressed, or encrypted.